diff --git a/include/cru/ui/document/DocumentElement.h b/include/cru/ui/document/DocumentElement.h
new file mode 100644
index 00000000..34c25f11
--- /dev/null
+++ b/include/cru/ui/document/DocumentElement.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "../Base.h"
+#include "DocumentElementType.h"
+
+namespace cru::ui::document {
+class CRU_UI_API DocumentElement : public Object {
+ public:
+  explicit DocumentElement(DocumentElementType* type);
+
+  ~DocumentElement() override;
+
+ public:
+  DocumentElementType* GetType() const { return type_; }
+
+ private:
+  DocumentElementType* type_;
+};
+}  // namespace cru::ui::document
diff --git a/include/cru/ui/document/DocumentElementType.h b/include/cru/ui/document/DocumentElementType.h
new file mode 100644
index 00000000..a94bf029
--- /dev/null
+++ b/include/cru/ui/document/DocumentElementType.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "cru/common/String.h"
+
+#include "../Base.h"
+
+namespace cru::ui::document {
+class CRU_UI_API DocumentElementType : public Object {
+ public:
+  explicit DocumentElementType(String name);
+
+  ~DocumentElementType() override;
+
+ public:
+  String GetName() const { return name_; }
+
+ private:
+  String name_;
+};
+
+struct CRU_UI_API DocumentElementTypes {
+  static DocumentElementType* const kRootElementType;
+};
+
+}  // namespace cru::ui::document
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index b6987c74..1e227fd7 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -24,6 +24,8 @@ add_library(CruUi
 	controls/TextHostControlService.cpp
 	controls/TreeView.cpp
 	controls/Window.cpp
+	document/DocumentElement.cpp
+	document/DocumentElementType.cpp
 	events/MouseEventArgs.cpp
 	helper/ClickDetector.cpp
 	helper/ShortcutHub.cpp
diff --git a/src/ui/document/DocumentElement.cpp b/src/ui/document/DocumentElement.cpp
new file mode 100644
index 00000000..4fa8adb1
--- /dev/null
+++ b/src/ui/document/DocumentElement.cpp
@@ -0,0 +1,8 @@
+#include "cru/ui/document/DocumentElement.h"
+#include "cru/ui/document/DocumentElementType.h"
+
+namespace cru::ui::document {
+DocumentElement::DocumentElement(DocumentElementType* type) : type_(type) {}
+
+DocumentElement::~DocumentElement() {}
+}  // namespace cru::ui::document
diff --git a/src/ui/document/DocumentElementType.cpp b/src/ui/document/DocumentElementType.cpp
new file mode 100644
index 00000000..8a057b69
--- /dev/null
+++ b/src/ui/document/DocumentElementType.cpp
@@ -0,0 +1,13 @@
+#include "cru/ui/document/DocumentElementType.h"
+
+#include <utility>
+
+namespace cru::ui::document {
+DocumentElementType::DocumentElementType(String name)
+    : name_(std::move(name)) {}
+
+DocumentElementType::~DocumentElementType() {}
+
+DocumentElementType* const DocumentElementTypes::kRootElementType =
+    new DocumentElementType(u"Root");
+}  // namespace cru::ui::document